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Message-Id: <20201017213611.2557565-13-vladimir.oltean@nxp.com>
Date: Sun, 18 Oct 2020 00:36:10 +0300
From: Vladimir Oltean <vladimir.oltean@....com>
To: netdev@...r.kernel.org
Cc: andrew@...n.ch, f.fainelli@...il.com, vivien.didelot@...il.com,
kuba@...nel.org, Christian Eggers <ceggers@...i.de>,
Kurt Kanzenbach <kurt@...utronix.de>,
Hauke Mehrtens <hauke@...ke-m.de>
Subject: [RFC PATCH 12/13] net: dsa: tag_gswip: let DSA core deal with TX reallocation
Now that we have a central TX reallocation procedure that accounts for
the tagger's needed headroom in a generic way, we can remove the
skb_cow_head call.
This one is interesting, the DSA tag is 8 bytes on RX and 4 bytes on TX.
Because DSA is unaware of asymmetrical tag lengths, the overhead/needed
headroom is declared as 8 bytes and therefore 4 bytes larger than it
needs to be. If this becomes a problem, and the GSWIP driver can't be
converted to a uniform header length, we might need to make DSA aware of
separate RX/TX overhead values.
Cc: Hauke Mehrtens <hauke@...ke-m.de>
Signed-off-by: Vladimir Oltean <vladimir.oltean@....com>
---
net/dsa/tag_gswip.c | 4 ----
1 file changed, 4 deletions(-)
diff --git a/net/dsa/tag_gswip.c b/net/dsa/tag_gswip.c
index 408d4af390a0..cde93ccb21ac 100644
--- a/net/dsa/tag_gswip.c
+++ b/net/dsa/tag_gswip.c
@@ -63,10 +63,6 @@ static struct sk_buff *gswip_tag_xmit(struct sk_buff *skb,
int err;
u8 *gswip_tag;
- err = skb_cow_head(skb, GSWIP_TX_HEADER_LEN);
- if (err)
- return NULL;
-
skb_push(skb, GSWIP_TX_HEADER_LEN);
gswip_tag = skb->data;
--
2.25.1
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